DC2262A-A - Demo Manual

DEMO MANUAL DC2262A-A
LT4276, LT4321 PoE with
Synchronous Forward and
Ideal Diode Bridge
Description
Demonstration circuit 2262 is a PoE Powered Device (PD)
with a synchronous forward isolated power supply featuring
the LT®4276 and an ideal diode bridge controller (LT4321).
The LT4276 provides IEEE802.3af (PoE, Type 1),
IEEE802.3at (PoE+, Type 2), and LTPoE++ PD interfacing
and power supply control. When the PD is connected to
a PSE, the LT4276 turns on an external, low-resistance,
high-power N-channel Hot Swap™ FET. The LT4276 controls a high-power, small-sized power supply that utilizes
a highly efficient, synchronously rectified, active clamp
forward topology. The LT4321 provides further efficiency
improvement by minimizing bridge losses.
The DC2262A-A supplies a 5V output at up to 13A. It
also demonstrates the use of an optional auxiliary power
supply input of 48V. When present, the auxiliary supply
takes priority over the PoE power path.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2262A-A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot
Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of
their respective owners.
Performance Summary
Specifications are at TA = 25°C
PARAMETER
CONDITIONS
Port Voltage (VPORT)
At Ethernet Port
37
Auxiliary Voltage
From AUX+ to AUX– Terminals
37
MIN
Output Voltage
TYP
MAX
57
V
57
V
5
Output Current
V
13
VPORT = 57V, IOUT = 13A
Output Voltage Ripple
42
Output Regulation
±0.1
VPORT = 41V, Ethernet Port to Output
Efficiency
Switching Frequency
UNITS
A
mVpp
%
92
%
250
kHz
Board Photo
Top Side
Bottom Side
dc2262aaf
1
DEMO MANUAL DC2262A-A
Typical Performance Characteristics
Top Side
Bottom Side
Figure 1. Thermal Pictures — VPORT = 57V, VOUT = 5V, IOUT = 13A
Efficiency vs Load Current
VOUT vs Load Current
94
5.20
92
5.15
5.10
88
5.05
86
VOUT(V)
EFFICIENCY (%)
90
84
4.95
82
4.90
80
VPORT = 41V
VPORT = 50V
VPORT = 57V
78
76
1
2
3
4
5 6 7 8 9 10 11 12 13
LOAD CURRENT (A)
DC2262AA F02
Figure 2. Efficiency (Ethernet Port to Output)
2
5.00
VPORT = 41V
VPORT = 50V
VPORT = 57V
4.85
4.80
1
2
3
4
5 6 7 8 9 10 11 12 13
LOAD CURRENT (A)
DC2262AA F03
Figure 3. Output Voltage Regulation
dc2262aaf
DEMO MANUAL DC2262A-A
Typical Performance Characteristics
Figure 4. Stresses (VPORT = 57V, 5V/13A)
Figure 5. Output Voltage Ripple (VPORT = 57V, 5V/13A)
dc2262aaf
3
DEMO MANUAL DC2262A-A
Typical Performance Characteristics
Figure 6. Load Transient Response (VPORT = 57V, 6.5A to 13A to 6.5A)
Figure 7. Gain and Phase Margin (VPORT = 57V, 5V/13A)
4
dc2262aaf
DEMO MANUAL DC2262A-A
Quick Start Procedure
Demonstration circuit 2262A-A is easy to set up to evaluate the performance of the LT4276 in a PoE application.
Refer to Figure 8 for proper equipment setup and follow
the procedure below:
NOTE: When measuring the input or output voltage ripple,
care must be taken to avoid a long ground lead on the
oscilloscope probe. Measure the output voltage ripple by
touching the probe tip and probe ground directly across
the +VOUT and –VOUT terminals. See Figure 9 for proper
scope probe technique.
1. Place test equipment (voltmeters, ammeters, power
supplies, and electronic load) as shown in Figure 8.
AUXILIARY
SUPPLY
–
DC1814A-D
LTPoE++ PSE
+
–
+
–
POWER
SUPPLY
–
2. Input supplies:
a. Connect a LTPoE+ capable PSE with a CAT-5 cable
to the RJ45 connector, J1 such as the DC1814A-D.
b.Or, connect a 37V to 57V capable power supply (“Power
Supply” in Figure 8) across VPORTP and VPORTN.
c. If evaluating the auxiliary power supply (“Auxiliary
Supply” in Figure 8), connect a 37V to 57V capable
power supply across AUX+ to AUX–.
3. Check for the proper output voltage of 5V.
4. Once the proper output voltage is confirmed, adjust
the load within the operating range and observe the
output voltage regulation, ripple voltage, efficiency,
and other parameters.
+
+
ETHERNET
CABLE
+
+
ELECTRONIC
LOAD
–
–
Figure 8. Proper Measurement Equipment Setup
+
–
DC2262AA F08
GND
VIN
Figure 9. Measuring Input or Output Ripple
dc2262aaf
5
DEMO MANUAL DC2262A-A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
DC2262A Required Circuit Components
1
2
CG1, CG2
CAP, CER, X7R 1000pF 2kV 10% 1808
MURATA GR442QR73D102KW01L
2
4
CT1, CT2, CT3, CT4
CAP, CER, X7R 0.01µF 100V 20% 0805
MURATA GRM21BR72A103MA01L
3
1
C9
CAP, ELEC, 22µF 100V 20% 8 X 10.2
SUNCON 100CE22KX
4
2
C10, C11
CAP, CER, X7R 2.2µF 100V 10% 1210
MURATA GRM32ER72A225KA35
5
0
C20
CAP, CER, OPT 1206
OPT
6
1
C17
CAP, CER, X7R 10µF 16V 10% 0805
MURATA GRM31CR71A106KA01
7
4
C5, C18, C29, C31
CAP, CER, X7R 0.1µF 50V 20% 0603
MURATA GRM188R71H104MA93
8
4
C19, C24, C38, C40
CAP, CER, X7R 2.2nF 2kV 10% 1812
MURATA GR443QR73D222KW01L
9
1
C21
CAP, CER, X7R 10nF 100V 10% 0603
MURATA GRM188R72A103KA01D
10
1
C22
CAP, CER, X7R 1nF 100V 10% 0603
MURATA GRM188R72A102KA01
11
2
C23, C39
CAP, CER, X7R 0.047µF 100V 10% 0603
KEMET C0603C473K1RACTU
12
0
C26
CAP, CER, OPT 0402
OPT
13
1
C33
CAP, CER, COG 100pF 50V 10% 0603
TDK C1608C0G1H101K080AA
14
1
C37
CAP, CER, X7R 100pF 50V 10% 0603
AVX 06035C101KAT2A
15
3
D2, D24, D25
DIODE, TVS, PTVS58VS1UR 58V SOD123
NXP PTVS58VS1UR
16
1
D3
DIODE, ZENER, MMSZ5252BS 24V SOD323
DIODES INC MMSZ5252BS
17
1
D12
DIODE, SCHOTTKY, PDS5100H 100V PowerDI5
DIODES INC PDS5100H
18
1
D21
DIODE, LED, 1208, GREEN
ROHM SML-010FTT86L
19
1
D22
DIODE, SILICON, BAV19WS 120V SOD-323
DIODES INC. BAV19WS
20
1
D23
DIODE, SCHOTTKY, CMMSH1-40L 40V SOD-123F
CENTRAL SEMI. CMMSH1-40L
21
1
D27
IC, REFERENCE, ZR431F01TA SOT23
DIODES INC ZR431F01TA
22
1
D29
DIODE, SCHOTTKY, BAT54WS 30V SOD323
DIODE INC BAT54WS
23
9
E1, E2, E3, E4, E5, E6, E7, E8, E9 TP, TURRET, PAD150-094 0.094"
MILL-MAX 2501-2-00-80-00-00-07-0
24
2
J1, J2
CONN, RJ-45, SS-6488-NF-K1
STEWART CONNECTOR SS-6488-NF-K1
ALTERNATE SS-6488S-A-NF
25
2
J3, J4
CONN, BANANA, 575-4 0.175"
KEYSTONE 575-4
26
1
L3
IND, 100µH DO1608
COILCRAFT DO1608C-104
27
1
L4
IND, CMC, 2.2mH WE-LF
WÜRTH 7446632002
28
1
Q11
MOSFET, N-CH, PSMN040-100MSE 100V LFPAK33
NXP PSMN040-100MSE
29
1
Q13
TRANSISTOR, PNP, FMMT723 100V SOT23
DIODES INC. FMMT723
30
1
Q15
MOSFET, N-CH, FDMC2523P 150V POWER33
FAIRCHILD FDMC2523P
31
8
Q17, Q18, Q19, Q20, Q21, Q22,
Q23, Q24
MOSFET, N-CH, PSMN075-100MSE 100 LFPAK33
NXP PSMN075-100MSE
32
8
RT1, RT2, RT3, RT4, RT5, RT6,
RT7, RT8
RES, CHIP, 75Ω 5% 0603
NIC NRC06J750TRF
33
1
R28
RES, CHIP, 47k 5% 0603
NIC NRC06J473TRF
34
3
R29, R38, R57
RES, CHIP, 10k 5% 0603
NIC NRC06J103TRF
35
0
R30, R35, R37
RES, CHIP, OPT 1206
OPT
36
1
R36
RES, CHIP, 3.3k 5% 0603
NIC NRC06J332TRF
37
3
R40, R42, R65
RES, CHIP, 0Ω 5% 0603
NIC NRC06ZOTRF
6
dc2262aaf
DEMO MANUAL DC2262A-A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
38
39
1
R41
RES, CHIP, 8.2Ω 5% 0805
NIC NRC10J8R2TRF
3
R43, R50, R60
RES, CHIP, 0Ω 5% 0402
NIC NRC04ZOTRF
40
1
R51
RES, CHIP, 100k 5% 0603
NIC NRC06J104TRF
41
1
R53
RES, CHIP, 107k 1% 0603
NIC NRC06F1073TRF
42
1
R56
RES, CHIP, 750Ω 5% 0603
VISHAY CRCW0603750RJNEA
43
1
R61
Res, CHIP, 0Ω 5% 0603
NIC NRC06ZOTRF
44
1
R62
Res, CHIP, 52.3k 1% 0603
NIC NRC06F5232TRF
45
1
R63
Res, CHIP, 174k 1% 0603
NIC NRC06F1743TRF
46
1
R66
RES, CHIP, 20Ω 5% 0805
NIC NRC06F20R0TRF
47
1
T1
TRANSFORMER, ETHERNET, 749022016
WÜRTH 749022016
48
2
U3, U5
OPTO, MOC207M SOIC-8
FAIRCHILD MOC207M
49
1
U7
IC, PoE IDEAL BRIDGE CONTROLLER, LT4321IUF QFN16 LINEAR TECHNOLOGY LT4321IUF
50
4
MH1, MH2, MH3, MH4
STANDOFF, SNAP ON, 0.625"
KEYSTONE 8834
DC2262A-A Required Circuit Components
1
0
C1, C2
CAP, CER, OPT 1206
OPT
2
0
C6
CAP, CER, OPT 1206
OPT
3
0
C16
CAP, CER, OPT 1206
OPT
4
2
C7, C13
CAP, CER, X5R 100µF 6.3V 20% 1210
MURATA GRM32ER60J107ME20
5
1
C8
CAP, ELEC, 100µF 6.3V 20% 6.3 X 6.0
SUNCON 6HVA100M
6
0
C12
CAP, CER, OPT 1206
OPT
7
1
C14
CAP, CER, X7R 0.1µF 250V 10% 1210
MURATA GRM32DR72E104KW01
8
1
C15
CAP, CER, X5R 10nF 250V 1206
MURATA GRM31B7U2E103JW31
9
0
C27
CAP, ELEC, OPT 8 X 10.5
OPT
10
0
C28
CAP, CER, OPT 1206
OPT
11
1
C35
CAP, CER, X7R 33nF 50V 10% 0603
TDK C1608X7R1H333K080AA
12
1
C32
CAP, CER, X7R 0.47µF 16V 10% 0805
MURATA GRM21BR71C474KA01L
13
1
C34
CAP, CER, X7R 4.7nF 50V 10% 0603
MURATA GRM188R71H472KA01D
14
1
C30
CAP, CER, X7R 10nF 50V 10% 0603
MURATA GRM188R71H103KA01D
15
1
D26
DIODE, ZENER, CMHZ4694 8.2V SOD-123
CENTRAL SEMI. CMHZ4694
16
2
D17, D18
DIODE, SCHOTTKY, CMMSH1-40L 40V SOD-123F
CENTRAL SEMI. CMMSH1-40L
17
2
D19, D20
DIODE, ZENER, CMHZ5248B SOD-123
CENTRAL SEMI. CMHZ5248B
18
1
D30
DIODE, SCHOTTKY, CMMSH1-40L 40V SOD-123F
CENTRAL SEMI. CMMSH1-40L
19
1
L1
IND, 2.2µH XAL1010
COILCRAFT XAL1010-222ME
20
1
L2
IND, 4.9µH 744314490
WÜRTH 744 314 490
21
0
L5
IND, OPT HC1
OPT
22
0
Q9, Q10
TRANSISTOR, NPN, OPT SOT23
OPT
23
2
Q12, Q14
MOSFET, N-CH, 40V 8-PowerTDFN
INFINEON BSC054N04NSG
24
1
Q16
MOSFET, N-CH, BSC190N12NS3 120V PG-TDSON-8
INFINEON BSC190N12NS3
25
1
Q25
TRANSISTOR, NPN, MMBT3904 40V SOT23
DIODES INC. MMBT3904
26
1
R26
RES, CHIP, 10Ω 5% 1206
NIC NRC12J100TRF
dc2262aaf
7
DEMO MANUAL DC2262A-A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
27
1
R27
RES, CHIP, 5.1Ω 5% 1206
NIC NRC12J5R1TRF
28
1
R52
RES, CHIP, 240Ω 5% 0603
VISHAY CRCW0603240RJNEA
29
1
R31
RES, CHIP, 620Ω 5% 1206
NIC NRC12J621TRF
30
0
R33
RES, CHIP, OPT 1206
OPT
31
1
R34
RES, CHIP, 100Ω 5% 1206
NIC NRC12J101TRF
32
1
R39
RES, CHIP, 13k 5% 0603
VISHAY CRCW060313K0JNEA
33
1
R44
RES, CHIP, 20m 1% 2010
VISHAY WSL2010R0200FEA
34
1
R45
Res, CHIP, 1k 5% 0603
NIC NRC06J102TRF
35
1
R46
Res, CHIP, 10Ω 5% 0805
NIC NRC06J100TRF
36
0
R64
Res, CHIP, OPT 0603
OPT
37
1
R47
RES, CHIP, 10.0k 1% 0603
NIC NRC06F1002TRF
38
1
R48
RES, CHIP, 64.9Ω 1% 0603
NIC NRC06F64R9TRF
39
1
R49
RES, CHIP, 80.6Ω 1% 0805
NIC NRC06F80R6TRF
40
2
R54, R55
RES, CHIP, 0Ω 5% 0805
NIC NRC10ZOTRF
41
1
R58
RES, CHIP, 10.0k 1% 0603
NIC NRC06F1002TRF
42
1
R59
Res, CHIP, 330Ω 5% 0603
VISHAY CRCW0603330RJNEA
43
1
T2
TRANSFORMER, FORWARD, 750313095 EFD20
WÜRTH 750 313 095
44
0
T3
TRANSFORMER, FORWARD, OPT PLANAR
OPT
45
1
U1
IC, PD & SWITCHER CONTROLLER, LT4276 QFN28
LINEAR TECHNOLOGY LT4276AHUFD
8
dc2262aaf
A
B
C
VDS_FREE
GND
GND
AUX-
E7
E6
E9
E5
E4
C22
1nF
100V
L5
OPT
16V
OPT
+C27
+VOUT
VPORTN
VPORTN
37V - 57V
VPORTP
VPORTP
Auxilliary Supply
37V - 57V
1
4
L4
2.2mH
7446632002
+VOUT
5
VDS_PRI
CT
VIN
V3RD
5
4
3
2
6
1
OPT
Optional Footprints
C24
2.2nF
2KV
1812
C19
2.2nF
2KV
1812
T3
2
3
10
11
7
8
VDS_FWD
VDS_FREE
C33
100pF
1
D12
PDS5100H
0805
R62
52.3k
1%
R63
174k
1%
L2
22uF
100V
+C9
4.9uH
744314490
C10
2.2uF
100V
1210
R48
64.9
1%
4
R49
80.6
1%
0805
4
3
14
2
VCC
RCLASS
RCLASS++
FB31
AUX
C23
0.047uF
U1
100V
LT4276AHUFD
HSS
AUX OFF: 27.3V
AUX ON: 28.3V
AUX HYS: 1.0V
R60
0
0402
D24 8.2
PTVS58VS1UR
R41
C21
10nF
0603
100V
R36
3.3K
PSMN040-100MSE
8
3
7
2
6
1
5
Q11
3
2
C17
10uF
1206
10V
C11
2.2uF
100V
1210
25
D22
BAV19WS
100uH
L3
Q13
FMMT723
R66
20
VCC
R39
13K
VIN
2
3
1
2
E8
1
2
4
1
exposed pad, solder side
VCC
PG
R40
0
C32
R53
0805
0.47uF 107K
ITHB
ISEN-
ISEN+
13
16
17
0.1uF
D23
CMMSH1-40L
C18
3
PG
C26
OPT
0402
0
R42
0
0402
0402
R50
0
R43
D29
BAT54WS
Q15
4
FDMC2523P
R38
10K
1210
C14
100 1206
R34
OPT
250V
C12
CT
V3RD
1206
10k
R29
VDS_PRI
10nF
1206
250V
250V C15
0.1uF
R30
OPT
1206
T2P
R56
750
VCC
5
6
7
8
2KV
C38
N/C
N/C
1812
2.2nF
U5
MOC207M
N/C
R44
20m
2010
1%
R35
OPT
1206
C28
OPT
1206
2
1
3
4
R64
OPT
R57
10K
+VOUT
E1
T2P
Q25
330
R59
D30
2
4.7nF
C34
D27
ZR431F01TA
1
3
1
240
R52
CUSTOMER NOTICE
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
SCALE = NONE
APP ENG. R. HUFF
PCB DES. R. HUFF
APPROVALS
C35
DATE:
N/A
SIZE
TECHNOLOGY
R58
10.0K
1%
-VOUT
1
SHEET 1
LT4276AHUFD, LT4321IUF
DEMO CIRCUIT 2262A-A
Tuesday, March 31, 2015
IC NO.
OF 2
3
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
E3
J4
+VOUT
+5V/13A
D21
LN1351C
GREEN
R31
620
1206
J3
R. HUFF
E2
DATE
01-19-2015
APPROVED
HIGH EFFICIENCY LTPOE++ PD INTERFACE
WITH INTEGRATED SWITCHING REGULATOR
TITLE: SCHEMATIC
33nF
6.3V
6HVA100M
100uF
+C8
+VOUT
C13
100uF
6.3V
1210
LIP2
1
DESCRIPTION
REVISION HISTORY
PRODUCTION
LIP1
R47
10.0K
1%
R65
0
+VOUT
C30
10nF
XAL1010-222ME
C7
100uF
6.3V
1210
REV
ECO
L1
2.2uH
VDS_FREE
C5
0.1uF
D26
8.2V
CMHZ4694
R45
1K
R46 CMMSH1-40L
10
0805
1
VGS_FWD
MMBT3904
C31
0.1uF
4
Q14
BSC054N04NS G
VDS_FWD
4
Q12
BSC054N04NS G
VGS_FREE
VDS_FREE
+VOUT
R28
47k
2
NOTES:
1. Unless otherwise noted, all resistors on this sheet are 0603, 5%
2. Unless otherwise noted, all capacitors on this sheet are 0603 and 50V
100pF
C37
100k
R51
C29
0.1uF
4
BSC190N12NS3
Q16
5
4
3
11
12
7
8
2
T2
750313095
6
1812
2KV
1
2.2nF
C40
5
7
8
6
N/C
2
N/C
N/C
1
3
U3
MOC207M 4
+VOUT
Figure 10. DC2262A-A Demo Circuit Schematic (Sheet 1)
T2P
3
D25
PTVS58VS1UR
ASSEMBLY VERSION OUTPUT
DC2262A-A
5V/13A
12V/7A
DC2262A-B
18
AUX+
28
VPORT
27
22
19
29
12
FFSDLY
2
1
1
2
20
PG
5
6
7
8
1
2
3
D
26
NC
DNC
GND
GND_EP
HSSRC
T2P
5
HSGATE
1
21
VCC
VCC
VCC
VCC
VCC
6
7
8
9
GND
23
SWVCC
SFST
11
24
SG
VIN
ROSC
10
RLDCMP
15
5
6
7
8
1
2
3
8
7
6
5
3
2
1
5
6
7
8
1
2
3
4
1
2
1
2
2
3
5
A
B
C
D
DEMO MANUAL DC2262A-A
Schematic Diagram
dc2262aaf
9
A
B
C
D
J1
SS-6488-NF-K1
1
2
3
4
5
6
7
8
DATA1-2
DATA2-1
DATA2-2
DATA2-1
DATA2-2
Q18
DATA1-1
Q17
CT2
0.01uF
100V
0805
CT1
0.01uF
100V
0805
RT4
75
CT4
0.01uF
100V
0805
CT3
0.01uF
100V
0805
XTX
X+
XTX
X+
XTX
X+
XTX
X+
RT3
75
5
DTD
D+
DTD
D+
DTD
D+
DTD
D+
3
1
2
6
4
5
9
7
8
12
10
11
RT5
75
Q20
PSMN075-100MSE
4BG12
DATA1-2
PSMN075-100MSE
4TG12
Q19
Q22
4
PSMN075-100MSE
4BG36
DATA2-1
PSMN075-100MSE
4TG36
Q21
Q23
Q24
PSMN075-100MSE
4BG78
PSMN075-100MSE
4TG78
RT8
75
1
2
3
4
5
6
7
8
3
VPORTN
VPORTP
3
4
DATA2-1
TG45
EP
OUTN
OUTN
EN
EN
OUTP
9
17
10
11
12
CUSTOMER NOTICE
TG45
IN45
IN36
TG36
DATA1-1
VPORTN
VPORTP
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
R61
0
APPROVALS
D3
MMSZ5252BS
24V
2
2
SCALE = NONE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
PCB DES. R. HUFF
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG. R. HUFF
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
2
1
DATA1-2
TG36
U7
LT4321IUF
OUT TO PHY
SS-6488-NF-K1
J2
3
BG12
Figure 11. DC2262A-A Demo Circuit Schematic (Sheet 2)
PSMN075-100MSE
4BG45
DATA2-2
PSMN075-100MSE
4TG45
RT7
75
CG1
1000pF
1808
2KV
RT6
75
PoE IDEAL DIODE BRIDGE
CG2
1000pF
1808
2KV
RT2
75
RT1
75
22
24
23
19
21
20
16
18
17
13
15
14
749022016
4
9
10
T1
NOTES:
1. Unless otherwise noted, all resistors on this sheet are 0603, 5%
DATA1-1
DATA1-2
Shield
C20
OPT
1206
DATA1-1
IN FROM
LTPoE++ PSE
37V-57V
9
10
Shield
8
7
6
5
3
2
1
8
7
6
5
3
2
1
8
7
6
5
3
2
1
8
7
6
5
3
2
1
8
7
6
5
3
2
1
8
7
6
5
3
2
1
8
7
6
5
3
2
1
8
7
6
5
3
2
1
TG12
16
5
TG12
BG36
TG78
TG78
15
IN12
14
BG12
IN78
6
1
2
13
BG36
DATA2-2
BG78
7
BG78
BG45
8
BG45
DATE:
N/A
SIZE
1
DESCRIPTION
DEMO CIRCUIT 2262A-A
1
SHEET 2
LT4276AHUFD, LT4321IUF
Tuesday, March 31, 2015
IC NO.
HIGH EFFICIENCY LTPOE++ PD INTERFACE
WITH INTEGRATED SWITCHING REGULATOR
TECHNOLOGY
KAUNG H.
OF 3
3
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
DATE
02-22-2012
APPROVED
REVISION HISTORY
1ST PROTOTYPE
D2
PTVS58VS1UR
1
REV
TITLE: SCHEMATIC
C39
0.047uF
100V
1
ECO
1
10
2
5
A
B
C
D
DEMO MANUAL DC2262A-A
Schematic Diagram
dc2262aaf
D17
CMMSH1-40L
Q9
OPT
C16
OPT
1206
R27
5.1
1206
R37
OPT
1206
D20
18V
CMHZ5248B
+VOUT
C2
OPT
1206
2
1
D18
CMMSH1-40L
Q10
OPT
DEMO MANUAL DC2262A-A
R55
0
0805
1
R54
0
0805
VGS_FWD
Schematic Diagram
VGS_FWD
VGS_FREE
2
1
3
1
4
2
C1
OPT
1206
VDS_FREE
VGS_FREE
C
VDS_FWD
D19
18V
CMHZ5248B
+VOUT
D17
CMMSH1-40L
Q9
OPT
C16
OPT
1206
R27
5.1
1206
R37
OPT
1206
D20
18V
CMHZ5248B
1
R33
OPT
1206
C1
OPT
1206
C2
OPT
1206
D18
CMMSH1-40L
Q10
OPT
1
R54
0
0805
VGS_FWD
2
1
2
R26
10
1206
2
C6
OPT
1206
1
+VOUT
VGS_FWD
C
R55
0
0805
VGS_FREE
2
D19
18V
CMHZ5248B
+VOUT
1
R33
OPT
1206
5
2
R26
10
1206
2
D
VDS_FWD
C6
OPT
1206
VGS_FREE
B
CUSTOMER NOTICE
APPROVALS
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. R. HUFF
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG. R. HUFF
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
B
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
4
TECHNOLOGY
TITLE: SCHEMATIC
SIZE
DATE:
3
IC NO.
LT4276AHUFD, LT4321IUF
DEMO CIRCUIT 2262A-A
Tuesday, March 31, 2015
SHEET 3
2
CUSTOMER NOTICE
Figure 12. DC2262A-A Demo Circuit Schematic (Sheet 3)
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
TECHNOLOGY
3
OF 3
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.co
Fax: (408)434-0507
LTC Confidential-For Customer Use On
TITLE: SCHEMATIC
HIGH EFFICIENCY LTPOE++ PD INTERFACE
WITH INTEGRATED SWITCHING REGULATOR
SIZE
IC NO.
DATE:
RE
LT4276AHUFD, LT4321IUF
N/A
SCALE = NONE
REV.
1
APPROVALS
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. R. HUFF
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG. R. HUFF
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
A
A
HIGH EFFICIENCY LTPOE++ PD INTERFACE
WITH INTEGRATED SWITCHING REGULATOR
N/A
SCALE = NONE
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
3
DEMO CIRCUIT 2262A-A
Tuesday, March 31, 2015
3
2
SHEET 3
1
dc2262aaf
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
OF
DEMO MANUAL DC2262A-A
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
12 Linear Technology Corporation
dc2262aaf
LT 0515 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2015
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